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Update documentation to remove incorrect GIT_DIFF_OPTS example.

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Git no longer calls an external diff program to generate patches.
Remove the documentation which suggests that you can pass
arbitrary diff options via the GIT_DIFF_OPTS environment variable.

Signed-off-by: Sean Estabrooks <seanlkml@sympatico.ca>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Sean 2006-11-27 14:37:43 -05:00 committed by Junio C Hamano
parent 3c23bea8ac
commit fde97d8ac6
2 changed files with 34 additions and 55 deletions
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57
Documentation/diff-format.txt
View file

@ -65,62 +65,17 @@ Generating patches with -p
When "git-diff-index", "git-diff-tree", or "git-diff-files" are run
with a '-p' option, they do not produce the output described above;
instead they produce a patch file.
instead they produce a patch file. You can customize the creation
of such patches via the GIT_EXTERNAL_DIFF and the GIT_DIFF_OPTS
environment variables.
The patch generation can be customized at two levels.
1. When the environment variable 'GIT_EXTERNAL_DIFF' is not set,
these commands internally invoke "diff" like this:
diff -L a/<path> -L b/<path> -pu <old> <new>
+
For added files, `/dev/null` is used for <old>. For removed
files, `/dev/null` is used for <new>
+
The "diff" formatting options can be customized via the
environment variable 'GIT_DIFF_OPTS'. For example, if you
prefer context diff:
GIT_DIFF_OPTS=-c git-diff-index -p HEAD
2. When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
program named by it is called, instead of the diff invocation
described above.
+
For a path that is added, removed, or modified,
'GIT_EXTERNAL_DIFF' is called with 7 parameters:
path old-file old-hex old-mode new-file new-hex new-mode
+
where:
<old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
contents of <old|new>,
<old|new>-hex:: are the 40-hexdigit SHA1 hashes,
<old|new>-mode:: are the octal representation of the file modes.
+
The file parameters can point at the user's working file
(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
when a new file is added), or a temporary file (e.g. `old-file` in the
index). 'GIT_EXTERNAL_DIFF' should not worry about unlinking the
temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
parameter, <path>.
git specific extension to diff format
-------------------------------------
What -p option produces is slightly different from the
traditional diff format.
What the -p option produces is slightly different from the traditional
diff format.
1. It is preceded with a "git diff" header, that looks like
this:
diff --git a/file1 b/file2
diff --git a/file1 b/file2
+
The `a/` and `b/` filenames are the same unless rename/copy is
involved. Especially, even for a creation or a deletion,

32
Documentation/git.txt
View file

@ -639,11 +639,35 @@ git Commits
git Diffs
~~~~~~~~~
'GIT_DIFF_OPTS'::
Only valid setting is "--unified=??" or "-u??" to set the
number of context lines shown when a unified diff is created.
This takes precedence over any "-U" or "--unified" option
value passed on the git diff command line.
'GIT_EXTERNAL_DIFF'::
see the "generating patches" section in :
gitlink:git-diff-index[1];
gitlink:git-diff-files[1];
gitlink:git-diff-tree[1]
When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
program named by it is called, instead of the diff invocation
described above. For a path that is added, removed, or modified,
'GIT_EXTERNAL_DIFF' is called with 7 parameters:
path old-file old-hex old-mode new-file new-hex new-mode
+
where:
<old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
contents of <old|new>,
<old|new>-hex:: are the 40-hexdigit SHA1 hashes,
<old|new>-mode:: are the octal representation of the file modes.
+
The file parameters can point at the user's working file
(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
when a new file is added), or a temporary file (e.g. `old-file` in the
index). 'GIT_EXTERNAL_DIFF' should not worry about unlinking the
temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
+
For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
parameter, <path>.
other
~~~~~